1. A rapid method for frontal plane axis determination in scalar electrocardiograms;Laiken;Am Heart J,1973
2. Pediatric Electrocardiography;Guntheroth,1965
3. The hemiblock: Diagnostic criteria and clinical significance;Rosenbaum;Mod Concepts Cardiovasc Dis,1970
4. Practical Electrocardiography;Marriott,1974
5. Diagnostic Electrocardiography and Vector cardiology;Friedman,1977